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[37] | 1 | function x = ispure_internal(q) |
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| 2 | % Determines whether q is pure. This function has to know the |
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| 3 | % representation of a quaternion, whereas the function ispure |
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| 4 | % does not. |
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| 5 | |
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| 6 | % Copyright © 2005 Stephen J. Sangwine and Nicolas Le Bihan. |
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| 7 | % See the file : Copyright.m for further details. |
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| 8 | |
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| 9 | error(nargchk(1, 1, nargin)), error(nargoutchk(0, 1, nargout)) |
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| 10 | |
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| 11 | x = isempty(q.w); % This is a call on the standard Matlab function |
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| 12 | % isempty() since q.w is not a quaternion. |
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